Electrolytic Defluoridation (EDF) Technique

In India, an estimated 62 million people, including 6 million children suffer from fluorosis due to consumption of excess fluoride contaminated water. As per BIS 10500, 2004 and WHO guideline the desirable limit of fluoride in drinking water is 1.0 mg/L, which can be extended to 1.5 mg/L in the absence of alternate source.

Electrolytic defluoridation process is a water purification system suitable for fluoride affected area with water containing excess fluoride. The defluoridation process is based on the principle of electrolysis, using aluminium plate electrodes placed in the raw water containing excess fluoride. During the electrolysis, anode gets ionized and fluoride is removed by complex formation, adsorption, precipitation, coagulation and settling.

Implementation

Adiwasi Kanya Shiksha Parisar , Chindwara Dist. (M.P.)

Sargapur, Seoni Dist. (M.P.)

Usarwara, Dist. Durg. (C.G.)

Dongargaon, Chandrapur Dist. (M.S.)

Adiwasi Kanya School , Chindwara Dist. (M.P.)

Salient Features

Removal of fluoride by active species of hydroxide of aluminium produced by passing DC power through aluminium electrodes

Simple to fabricate, easy to operate with minimum maintenance

Suitable for treatment of raw water with fluoride concentration upto 10 mg/L

Produces potable water with palatable taste as against the other available chemical treatment methods

Quantity of sludge produced is much less (60-70%) than conventional treatment methods